Haveing trouble with task scheduler

Hi I just installed Windows XP Pro. with service pack 2 and I can not get the task scheduler to work. Every time I go to add a task I get the following error message.
The attempt to retrieve account information for the specified task failed; therefore, the task did not run. Either an error occurred, or no account information existed for the task.
The specific error is:
0x8004130f: No account information could be found in the Task Scheduler security database for the task indicated.

Does anyone have any Ideas on how I can get this to work cause I cannot install any antivirus or firewall without it working.

Thank you.

Corey